109 lines
2.1 KiB
C
109 lines
2.1 KiB
C
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#ifndef __I2C_KEYWEST_H__
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#define __I2C_KEYWEST_H__
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/* The Tumbler audio equalizer can be really slow sometimes */
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#define POLL_TIMEOUT (2*HZ)
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/* Register indices */
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typedef enum {
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reg_mode = 0,
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reg_control,
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reg_status,
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reg_isr,
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reg_ier,
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reg_addr,
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reg_subaddr,
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reg_data
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} reg_t;
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/* Mode register */
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#define KW_I2C_MODE_100KHZ 0x00
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#define KW_I2C_MODE_50KHZ 0x01
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#define KW_I2C_MODE_25KHZ 0x02
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#define KW_I2C_MODE_DUMB 0x00
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#define KW_I2C_MODE_STANDARD 0x04
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#define KW_I2C_MODE_STANDARDSUB 0x08
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#define KW_I2C_MODE_COMBINED 0x0C
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#define KW_I2C_MODE_MODE_MASK 0x0C
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#define KW_I2C_MODE_CHAN_MASK 0xF0
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/* Control register */
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#define KW_I2C_CTL_AAK 0x01
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#define KW_I2C_CTL_XADDR 0x02
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#define KW_I2C_CTL_STOP 0x04
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#define KW_I2C_CTL_START 0x08
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/* Status register */
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#define KW_I2C_STAT_BUSY 0x01
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#define KW_I2C_STAT_LAST_AAK 0x02
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#define KW_I2C_STAT_LAST_RW 0x04
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#define KW_I2C_STAT_SDA 0x08
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#define KW_I2C_STAT_SCL 0x10
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/* IER & ISR registers */
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#define KW_I2C_IRQ_DATA 0x01
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#define KW_I2C_IRQ_ADDR 0x02
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#define KW_I2C_IRQ_STOP 0x04
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#define KW_I2C_IRQ_START 0x08
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#define KW_I2C_IRQ_MASK 0x0F
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/* Physical interface */
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struct keywest_iface
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{
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struct device_node *node;
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void __iomem * base;
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unsigned bsteps;
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int irq;
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spinlock_t lock;
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struct keywest_chan *channels;
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unsigned chan_count;
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u8 cur_mode;
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char read_write;
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u8 *data;
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unsigned datalen;
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int state;
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int result;
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struct timer_list timeout_timer;
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struct completion complete;
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};
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enum {
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state_idle,
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state_addr,
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state_read,
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state_write,
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state_stop,
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state_dead
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};
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/* Channel on an interface */
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struct keywest_chan
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{
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struct i2c_adapter adapter;
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struct keywest_iface* iface;
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unsigned chan_no;
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};
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/* Register access */
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static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg)
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{
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return in_8(iface->base
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+ (((unsigned)reg) << iface->bsteps));
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}
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static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val)
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{
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out_8(iface->base
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+ (((unsigned)reg) << iface->bsteps), val);
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(void)__read_reg(iface, reg_subaddr);
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}
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#define write_reg(reg, val) __write_reg(iface, reg, val)
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#define read_reg(reg) __read_reg(iface, reg)
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#endif /* __I2C_KEYWEST_H__ */
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